CN114516761A - 高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料及其制备方法和应用 - Google Patents
高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料及其制备方法和应用 Download PDFInfo
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Abstract
本发明公开了一种高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料及其制备方法。热障涂层材料为x[nRE1/nAlO3]‑(1‑x)[n(RE1/n)2Zr2O7](0<x≤0.5,5≤n≤13)。制备方法如下:S1将符合化学计量比的稀土源、锆源和铝源制成混合溶液;S2将混合溶液在搅拌状态下加入到氨水溶液中并始终保持体系的pH值≥10.0;S3洗涤并烘干S2所得的沉淀产物;S4进行热处理,在温度为950℃~1600℃,热处理2~20h。本发明的双相高熵热障涂层材料具有良好的高温相稳定性和高的断裂韧性,其断裂韧性达到1.92~2.77MPa·m1/2。
Description
技术领域
本发明涉及复合材料技术领域,尤其涉及一种高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料及其制备方法和应用。
背景技术
随着航空发动机向更高推重比、更高进口温度的方向发展,对发动机热端部件表面的热防护材料热障涂层提出了更高要求。目前广泛应用的YSZ(钇稳定氧化锆)热障涂层陶瓷层材料在超过1200℃时会发生相变和快速烧结从而带来涂层隔热性能和应变容限的降低,产生的局部应力集中也会导致涂层过早脱落和失效。YSZ材料难以满足新一代先进航空发动机的设计要求。因此,亟需开发能在1300℃以上稳定服役的热障涂层陶瓷材料。
稀土锆酸盐材料(RE2Zr2O7)由于其低的热导率、好的高温稳定性、低的烧结速率等优点被认为是目前最有潜力的热障涂层材料之一。但由于其热膨胀系数较低、断裂韧性较差,热循环过程中容易发生开裂脱落,极大地限制了该材料在热障涂层领域的实际应用。高熵陶瓷多主元组合设计可为陶瓷材料的性能设计和剪裁提供更高的自由度和多样性。研究表明,采用高熵陶瓷设计的稀土锆酸盐材料nRE1/nZr2O7(5≤n≤13)不仅具有良好的高温相稳定性、抗烧结性,其热膨胀系数还得到了有效提升。然而,高熵稀土锆酸盐材料的断裂韧性等力学性能的提升仍然不够理想。
发明内容
本发明的目的在于,针对上述现有技术的不足,提出一种具有良好的高温相稳定性和较高的断裂韧性的高熵稀土铝酸盐增韧高熵稀土锆酸盐高断裂韧性热障涂层材料及其制备方法和应用。
本发明的一种高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料,所述热障涂层材料的化学组成为x[nRE1/nAlO3]-(1-x)[n(RE1/n)2Zr2O7](0<x≤0.5,5≤n≤13),其中,x为高熵稀土铝酸盐的摩尔含量,1-x为高熵稀土锆酸盐的摩尔含量,n为稀土元素RE的个数(n为正整数),且每种化学组成中所选稀土元素RE的配比均为等摩尔比,即1/n。
进一步的,所述稀土元素RE包括Y、Sc和镧系除放射性Pm元素之外的其余元素。
一种高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料的制备方法,包括如下步骤:
S1混合溶液的配制
将符合化学计量比的稀土源、锆源和铝源制成混合溶液;
S2反向滴定
将步骤S1所得的混合溶液在搅拌状态下加入到氨水溶液中并始终保持体系的pH值≥10.0;
S3洗涤与烘干
洗涤并烘干S2所得的共沉淀产物,得非晶态前驱体粉末;
S4热处理
将步骤S3所得的非晶态前驱体粉末进行热处理,在温度为950℃~1600℃,热处理2~20h,得到高熵稀土铝酸盐增韧的高熵稀土锆酸盐材料。
进一步的,所述稀土源包括稀土氧化物、稀土硝酸盐、稀土氯化物或稀土硫酸盐。
进一步的,所述锆源采用水合氯氧化锆,所述铝源采用水合硝酸铝。
进一步的,步骤S3中的洗涤过程如下:先采用去离子水洗涤共沉淀产物,再用乙醇和正丁醇分别洗涤多次。乙醇和正丁醇去除残余的酸碱和杂质离子,正丁醇除了洗涤作用,其实它最核心的作用在于对粉体进行分散,采用正丁醇洗涤有利于粉体在后面烧结时形成晶粒更细小的甚至是纳米结构。
进一步的,步骤S3中洗涤后的共沉淀产物烘干获得非晶态前驱体粉末。
一种高断裂韧性的热障涂料,包括上述的高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料。
本发明的双相高熵热障涂层材料具有良好的高温相稳定性和高的断裂韧性,比如:其断裂韧性相比于单相高熵稀土锆酸盐提高13%~63%,相比于纯锆酸镧提高了39%~100%,达到1.92~2.77MPa·m1/2。在下一代热障涂层领域有广阔的应用前景。
附图说明
图1为本实施例1所制得的高熵稀土铝酸盐增韧高熵稀土锆酸盐高断裂韧性热障涂层材料的X射线衍射图谱;
图2为本实施例2所制得的高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料的X射线衍射图谱;
图3为本实施例3所制得的高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料的X射线衍射图谱;
图4为本实施例4所制得的高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料的X射线衍射图谱;
图5为本实施例5所制得的高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料的X射线衍射图谱;
图6为本实施例6所制得的高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料的X射线衍射图谱。
具体实施方式
以下是本发明的具体实施例并结合附图,对本发明的技术方案作进一步的描述,但本发明并不限于这些实施例。
实施例1:
一种高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料,化学组成为x[nRE1/nAlO3]-(1-x)[n(RE1/n)2Zr2O7](0<x≤0.5,5≤n≤13),当x=0.1,n=5,其化学组成为0.1[5RE0.2AlO3]-0.9[5(RE0.2)2Zr2O7],RE优选为La、Sm、Eu、Gd、Yb时,其化学组成为:0.1(La0.2Sm0.2Eu0.2Gd0.2Yb0.2)AlO3-0.9(La0.2Sm0.2Eu0.2Gd0.2Yb0.2)2Zr2O7,所述高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料的制备方法包括:
(1)混合溶液的配制
称取4.1273g氧化镧、4.4169g氧化钐、4.4578g氧化铕、4.5917g氧化钆、4.9917g氧化镱,分别溶解于硝酸中,搅拌速率400rpm,温度65℃,等待所有氧化物均溶解澄清再混合、搅拌;称取38.6700g八水合二氯氧化锆,2.5009g九水合硝酸铝溶解在适量去离子水中;将所有溶液混合在一起形成共混合溶液;
(2)反向滴定
将步骤(1)所得的混合溶液在搅拌状态下滴加到氨水溶液中,并始终保持体系的pH≥10.0,直至沉淀反应完全;
(3)洗涤与烘干
将步骤(2)所得的共沉淀产物采用无机陶瓷膜反复冲洗0.5小时,改用无水乙醇和正丁醇分别洗涤多次,直至洗涤液pH=7并用硝酸银检验无氯离子为止,停止洗涤,滤饼在120℃烘干12h,获得非晶态前驱体粉末;
(4)热处理
将步骤(3)所得的非晶态前驱体粉末在普通电炉中进行热处理,热处理温度为950℃、热处理时间2h。
对于热处理得到的粉末样品进行X射线衍射检测,结果如图1所示。
对于热处理得到的粉末样品在放电等离子烧结系统中进行热处理,1600℃,热处理时间6min,所制备的块体样品采用纳米压痕法测试断裂韧性,结果为:1.92±0.08MPa·m1/2。
实施例2:
一种高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料,化学组成为x[nRE1/nAlO3]-(1-x)[n(RE1/n)2Zr2O7](0<x≤0.5,5≤n≤13),当x=0.2,n=5,其化学组成为0.2[5RE0.2AlO3]-0.8[5(RE0.2)2Zr2O7],RE优选为La、Sm、Eu、Gd、Yb时,其化学组成为:0.2(La0.2Sm0.2Eu0.2Gd0.2Yb0.2)AlO3-0.8(La0.2Sm0.2Eu0.2Gd0.2Yb0.2)2Zr2O7,所述高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料的制备方法包括:
(1)混合溶液的配制
称取3.9101g氧化镧、4.1844g氧化钐、4.2232g氧化铕、4.3500g氧化钆、4.7290g氧化镱,分别溶解于硝酸中,搅拌速率600rpm,温度85℃,等待所有氧化物均溶解澄清再混合、搅拌;称取34.3733g八水合二氯氧化锆,5.0017g九水合硝酸铝溶解在适量去离子水中;将所有溶液混合在一起形成共混合溶液;
(2)反向滴定
将步骤(1)所得的混合溶液在搅拌状态下滴加到氨水溶液中,并保持体系的pH=11.0,直至沉淀反应完全;
(3)洗涤与烘干
将步骤(2)所得的共沉淀产物采用无机陶瓷膜反复冲洗1小时,改用无水乙醇和正丁醇分别洗涤多次,直至洗涤液pH=7并用硝酸银检验无氯离子为止,停止洗涤,滤饼在110℃烘干24h,获得非晶态前驱体粉末;
(4)热处理
将步骤(3)所得的非晶态前驱体粉末在普通电炉中进行热处理,热处理温度分别为1150℃,热处理时间5h。
对于热处理得到的粉末样品进行X射线衍射检测,结果如图2所示。
对于热处理得到的粉末样品在放电等离子烧结系统中进行热处理,1600℃,热处理时间6min,所制备的块体样品采用纳米压痕法测试断裂韧性,结果为:1.98±0.18MPa·m1/2。
实施例3:
一种高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料,化学组成为x[nRE1/nAlO3]-(1-x)[n(RE1/n)2Zr2O7](0<x≤0.5,5≤n≤13),当x=0.3,n=5,其化学组成为0.3[5RE0.2AlO3]-0.7[5(RE0.2)2Zr2O7],RE优选为La、Sm、Eu、Gd、Yb时,其化学组成为:0.3(La0.2Sm0.2Eu0.2Gd0.2Yb0.2)AlO3-0.7(La0.2Sm0.2Eu0.2Gd0.2Yb0.2)2Zr2O7,所述高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料的制备方法包括:
(1)混合溶液的配制
称取3.6929g氧化镧、3.9519g氧化钐、3.9885g氧化铕、4.1083g氧化钆、4.4662g氧化镱,分别溶解于硝酸中,搅拌速率550rpm,温度105℃,等待所有氧化物均溶解澄清再混合、搅拌;称取30.0767g八水合二氯氧化锆,7.5026g九水合硝酸铝溶解在适量去离子水中;将所有溶液混合在一起形成共混合溶液;
(2)反向滴定
将步骤(1)所得的混合溶液在不断搅拌状态下滴加到氨水溶液中,并始终通过添加氨水来调控沉淀物溶液体系的pH=12.0,直至沉淀反应完全;
(3)洗涤与烘干
将步骤(2)所得的共沉淀产物采用无机陶瓷膜反复冲洗1.5小时,改用无水乙醇和正丁醇分别洗涤多次,直至洗涤液pH=7并用硝酸银检验无氯离子,停止洗涤,滤饼在105℃烘干48h,获得非晶态前驱体粉末;
(4)热处理
将步骤(3)所得的非晶态前驱体粉末在电炉中进行热处理、1350℃,热处理时间6h。
对于热处理得到的粉末样品进行X射线衍射检测,结果如图3所示。
对于热处理得到的粉末样品在放电等离子烧结系统中进行热处理,1600℃,热处理时间6min,所制备的块体样品采用纳米压痕法测试断裂韧性,结果为:2.77±0.14MPa·m1/2。
实施例4:
一种高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料,化学组成为x[nRE1/nAlO3]-(1-x)[n(RE1/n)2Zr2O7](0<x≤0.5,5≤n≤13),当x=0.4,n=5,其化学组成为0.4[5RE0.2AlO3]-0.6[5(RE0.2)2Zr2O7],RE优选为La、Sm、Eu、Gd、Yb时,其化学组成为:0.4(La0.2Sm0.2Eu0.2Gd0.2Yb0.2)AlO3-0.6(La0.2Sm0.2Eu0.2Gd0.2Yb0.2)2Zr2O7,所述高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料的制备方法包括:
(1)混合溶液的配制
称取3.4756g氧化镧、3.7195g氧化钐、3.7539g氧化铕、3.8667g氧化钆、4.2035g氧化镱,分别溶解于硝酸中,搅拌速率350rpm,温度75℃,等待所有氧化物均溶解澄清再混合、搅拌;称取25.7800g八水合二氯氧化锆,7.5026g九水合硝酸铝溶解在适量去离子水中;将所有溶液混合在一起形成共混合溶液;
(2)反向滴定
将步骤(1)所得的混合溶液在搅拌状态下滴加到氨水溶液中,并保持体系的pH=13.0,直至沉淀反应完全;
(3)洗涤与烘干
将步骤(2)所得的共沉淀产物采用无机陶瓷膜反复冲洗2小时,改用无水乙醇和正丁醇分别洗涤多次,直至洗涤液pH=7并用硝酸银检验无氯离子,停止洗涤,滤饼在125℃烘干20h,获得非晶态前驱体粉末;
(4)热处理
将步骤(3)所得的非晶态前驱体粉末在电炉中进行热处理,热处理温度分别为1550℃,热处理时间15h。
对于热处理得到的粉末样品进行X射线衍射检测,结果如图4所示。
对于热处理得到的粉末样品在放电等离子烧结系统中进行热处理,1600℃,热处理时间6min,所制备的块体样品采用纳米压痕法测试断裂韧性,结果为:2.25±0.10MPa·m1/2。
实施例5:
一种高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料,化学组成为x[nRE1/nAlO3]-(1-x)[n(RE1/n)2Zr2O7](0<x≤0.5,5≤n≤13),当x=0.5,n=5,其化学组成为0.5[5RE0.2AlO3]-0.5[5(RE0.2)2Zr2O7],RE优选为La、Sm、Eu、Gd、Yb时,其化学组成为:0.5(La0.2Sm0.2Eu0.2Gd0.2Yb0.2)AlO3-0.5(La0.2Sm0.2Eu0.2Gd0.2Yb0.2)2Zr2O7,所述高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料的制备方法包括:
(1)混合溶液的配制
称取3.2584g氧化镧、3.4870g氧化钐、3.5193g氧化铕、3.6250g氧化钆、3.9408g氧化镱,分别溶解于硝酸中,搅拌速率550rpm,温度85℃,等待所有氧化物均溶解澄清再混合、搅拌;称取21.4833g八水合二氯氧化锆,12.5043g九水合硝酸铝溶解在适量去离子水中;将所有溶液混合在一起形成共混合溶液;
(2)反向滴定
将步骤(1)所得的混合溶液在搅拌状态下滴加到氨水溶液中,并保持体系的pH=11.0,直至沉淀反应完全;
(3)洗涤与烘干
将步骤(2)所得的共沉淀产物采用无机陶瓷膜反复冲洗2.5小时,改用无水乙醇和正丁醇分别洗涤多次,直至洗涤液pH=7并用硝酸银检验无氯离子,停止洗涤,滤饼在130℃烘干24h,获得非晶态前驱体粉末;
(4)热处理
将步骤(3)所得的非晶态前驱体粉末在电炉中进行热处理,热处理温度为1600℃,热处理时间20h。
对于热处理得到的粉末样品进行X射线衍射检测,结果如图5所示。
对于热处理得到的粉末样品在放电等离子烧结系统中进行热处理,1600℃,热处理时间6min,所制备的块体样品采用纳米压痕法测试断裂韧性,结果为:2.06±0.06MPa·m1/2。
实施例6:
一种高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料,化学组成为x[nRE1/nAlO3]-(1-x)[n(RE1/n)2Zr2O7](0<x≤0.5,5≤n≤13),当x=0.3,n=9,其化学组成为0.3[9RE1/9AlO3]-0.7[9(RE1/9)2Zr2O7],RE优选为Y、La、Nd、Sm、Eu、Gd、Tb、Dy、Yb时,其化学组成为:0.3(Y1/9La1/9Nd1/9Sm1/9Eu1/9Gd1/9Tb1/9Dy1/9Yb1/9)AlO3-0.7(Y1/9La1/9Nd1/9Sm1/9Eu1/ 9Gd1/9Tb1/9Dy1/9Yb1/9)2Zr2O7,所述高熵稀土铝酸盐增韧高熵稀土锆酸盐的高断裂韧性热障涂层材料的制备方法包括:
(1)混合溶液的配制
称取1.4218g氧化钇、2.0516g氧化镧、2.1185g氧化钕、2.1955g氧化钐、2.2159g氧化铕、2.2824g氧化钆、2.3035g氧化铽、2.3485g氧化镝、2.4812g氧化镱,分别溶解于硝酸中,搅拌速率550rpm,温度105℃,等待所有氧化物均溶解澄清再混合、搅拌;称取30.0767g八水合二氯氧化锆,7.5026g九水合硝酸铝溶解在适量去离子水中;将所有溶液混合在一起形成共混合溶液;
(2)反向滴定
将步骤(1)所得的混合溶液在不断搅拌状态下滴加到氨水溶液中,并始终通过添加氨水来调控沉淀物溶液体系的pH=11.0,直至沉淀反应完全;
(3)洗涤与烘干
将步骤(2)所得的共沉淀产物采用无机陶瓷膜反复冲洗1.5小时,改用无水乙醇和正丁醇分别洗涤多次,直至洗涤液pH=7并用硝酸银检验无氯离子,停止洗涤,滤饼在105℃烘干48h,获得非晶态前驱体粉末;
(4)热处理
将步骤(3)所得的非晶态前驱体粉末在电炉中进行热处理、1350℃,热处理时间6h。
对于热处理得到的粉末样品进行X射线衍射检测,结果如图6所示。
对于热处理得到的粉末样品在放电等离子烧结系统中进行热处理,1600℃,热处理时间6min,所制备的块体样品采用纳米压痕法测试断裂韧性,结果为:2.73±0.03MPa·m1/2。
对比例1:
一种锆酸镧热障涂层材料,化学组成为La2Zr2O7,所述锆酸镧热障涂层材料的制备方法包括:
(1)混合溶液的配制
称取3.2584g氧化镧溶解于硝酸中,搅拌速率550rpm,温度105℃,等待氧化镧溶解澄清再混合、搅拌;称取6.4450g八水合二氯氧化锆溶解在适量去离子水中;将溶液混合在一起形成共混合溶液;
(2)反向滴定
将步骤(1)所得的混合溶液在不断搅拌状态下滴加到氨水溶液中,并始终通过添加氨水来调控沉淀物溶液体系的pH=12.0,直至沉淀反应完全;
(3)洗涤与烘干
将步骤(2)所得的共沉淀产物采用无机陶瓷膜反复冲洗1.5小时,改用无水乙醇和正丁醇分别洗涤多次,直至洗涤液pH=7并用硝酸银检验无氯离子,停止洗涤,滤饼在105℃烘干48h,获得非晶态前驱体粉末;
(4)热处理
将步骤(3)所得的非晶态前驱体粉末在电炉中进行热处理、1350℃,热处理时间6h。
对于热处理得到的粉末样品在放电等离子烧结系统中进行热处理,1600℃,热处理时间6min,所制备的块体样品采用纳米压痕法测试断裂韧性,结果为:1.38±0.05MPa·m1/2。
对比例2:
一种高熵稀土锆酸盐热障涂层材料,化学组成为(La0.2Sm0.2Eu0.2Gd0.2Yb0.2)2Zr2O7,所述高熵稀土锆酸盐热障涂层材料的制备方法包括:
(1)混合溶液的配制
称取4.3445g氧化镧、4.6493g氧化钐、4.6924g氧化铕、4.8333g氧化钆、5.2544g氧化镱,分别溶解于硝酸中,搅拌速率550rpm,温度105℃,等待所有氧化物均溶解澄清再混合、搅拌;称取42.9667g八水合二氯氧化锆溶解在适量去离子水中;将所有溶液混合在一起形成共混合溶液;
(2)反向滴定
将步骤(1)所得的混合溶液在不断搅拌状态下滴加到氨水溶液中,并始终通过添加氨水来调控沉淀物溶液体系的pH=12.0,直至沉淀反应完全;
(3)洗涤与烘干
将步骤(2)所得的共沉淀产物采用无机陶瓷膜反复冲洗1.5小时,改用无水乙醇和正丁醇分别洗涤多次,直至洗涤液pH=7并用硝酸银检验无氯离子,停止洗涤,滤饼在105℃烘干48h,获得非晶态前驱体粉末;
(4)热处理
将步骤(3)所得的非晶态前驱体粉末在电炉中进行热处理、1350℃,热处理时间6h。
对于热处理得到的粉末样品在放电等离子烧结系统中进行热处理,1600℃,热处理时间6min,所制备的块体样品采用纳米压痕法测试断裂韧性,结果为:1.70±0.11MPa·m1/2。
图1-图5分别为实施例1-5的热处理得到的粉末样品进行X射线衍射检测结果,结果显示,随着高熵铝酸盐摩尔含量的增加,双相高熵陶瓷的X射线衍射特征峰均只显示两种对应的物相结构,这种衍射结构特征峰的峰强积分面积随着高熵铝酸盐含量的增加而呈现线性增加的规律变化。此外,物相特征峰不随煅烧温度和保温时间的变化而变化,表明这些双相高熵陶瓷在高温下的相稳定性良好。
表1为高熵稀土铝酸盐增韧高熵稀土锆酸盐采用SPS制备的块体材料的断裂韧性与纯锆酸镧断裂韧性的具体数值(测试方法为纳米压痕法,每个样品表面经逐级打磨抛光后,采用Vickers压头5000mN压力保压20s,测试20个数据点取平均值并计算标准偏差)。
表1实施例和对比例的断裂韧性数值
以上未涉及之处,适用于现有技术。
虽然已经通过示例对本发明的一些特定实施例进行了详细说明,但是本领域的技术人员应该理解,以上示例仅是为了进行说明,而不是为了限制本发明的范围,本发明所属技术领域的技术人员可以对所描述的具体实施例来做出各种各样的修改或补充或采用类似的方式替代,但并不会偏离本发明的方向或者超越所附权利要求书所定义的范围。本领域的技术人员应该理解,凡是依据本发明的技术实质对以上实施方式所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围。
Claims (8)
1.一种高熵稀土铝酸盐增韧高熵稀土锆酸盐高断裂韧性热障涂层材料,其特征在于:所述热障涂层材料的化学组成为x[nRE1/nAlO3]-(1-x)[n(RE1/n)2Zr2O7](0<x≤0.5,5≤n≤13),其中,x为高熵稀土铝酸盐的摩尔含量,1-x为高熵稀土锆酸盐的摩尔含量,n为稀土元素RE的个数(n为正整数),且每种化学组成中所选稀土元素RE的配比均为等摩尔比,即1/n。
2.如权利要求1所述的一种高熵稀土铝酸盐增韧高熵稀土锆酸盐高断裂韧性热障涂层材料,其特征在于:所述稀土元素RE包括Y、Sc和镧系除放射性Pm元素之外的其余元素。
3.一种如权利要求1所述的高熵稀土铝酸盐增韧高熵稀土锆酸盐高断裂韧性热障涂层材料的制备方法,其特征在于:包括如下步骤:
S1混合溶液的配制
将符合化学计量比的稀土源、锆源和铝源制成混合溶液;
S2反向滴定
将步骤S1所得的混合溶液在搅拌状态下加入到氨水溶液中并始终保持体系的pH值≥10.0;
S3洗涤与烘干
洗涤并烘干S2所得的共沉淀产物,得非晶态前驱体粉末;
S4热处理
将步骤S3所得的非晶态前驱体粉末进行热处理,在温度为950℃~1600℃,热处理2~20h,得到高熵稀土铝酸盐增韧高熵稀土锆酸盐高断裂韧性热障涂层材料。
4.如权利要求3所述的一种高熵稀土铝酸盐增韧高熵稀土锆酸盐高断裂韧性热障涂层材料的制备方法,其特征在于:所述稀土源包括稀土氧化物、稀土硝酸盐、稀土氯化物或稀土硫酸盐。
5.如权利要求4所述的一种高熵稀土铝酸盐增韧高熵稀土锆酸盐高断裂韧性热障涂层材料的制备方法,其特征在于:所述锆源采用水合氯氧化锆,所述铝源采用水合硝酸铝。
6.如权利要求5所述的一种高熵稀土铝酸盐增韧高熵稀土锆酸盐高断裂韧性热障涂层材料的制备方法,其特征在于:步骤S3中的洗涤过程如下:先采用去离子水洗涤共沉淀产物,再用乙醇和正丁醇分别洗涤。
7.如权利要求6所述的一种高熵稀土铝酸盐增韧高熵稀土锆酸盐高断裂韧性热障涂层材料的制备方法,其特征在于:步骤S3中洗涤后的共沉淀产物烘干,获得非晶态前驱体粉末。
8.一种高断裂韧性的热障涂料,其特征在于:包括如权利要求1-2任一项所述的高熵稀土铝酸盐增韧高熵稀土锆酸盐高断裂韧性热障涂层材料。
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